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is a significant concern for physicians. Central. K4 z9 a0 m8 H6 g3 V
precocious puberty (CPP), which is mediated1 h+ E& i/ ~7 v) G" w. R! t3 A% U
through the hypothalamic pituitary gonadal axis, has
* ^1 L1 u+ ]4 ] h7 ~2 h" J/ ua higher incidence of organic central nervous system+ P9 [7 g$ `, U6 W
lesions in boys.1,2 Virilization in boys, as manifested
: B+ Y& d" j0 d ]) B+ [by enlargement of the penis, development of pubic$ B& |7 R8 L3 m9 S/ p0 z# R) H
hair, and facial acne without enlargement of testi-
6 X* u$ c T/ T; n) Vcles, suggests peripheral or pseudopuberty.1-3 We
2 j. C; G( h) Z3 R" n; z) L( D treport a 16-month-old boy who presented with the
) x; }2 S' R$ I' C7 Genlargement of the phallus and pubic hair develop-2 p2 V2 d! l9 n; C' l N! H
ment without testicular enlargement, which was due
! O- G2 n8 Q: E1 B& C) @3 J$ Eto the unintentional exposure to androgen gel used by8 w, b1 T$ k( k2 r* T9 j8 R8 j& Y
the father. The family initially concealed this infor-
7 G5 f; W1 l1 D* ~; Pmation, resulting in an extensive work-up for this
" y8 v$ c+ {7 ?4 Lchild. Given the widespread and easy availability of$ h% H8 N4 I1 B$ [ q {
testosterone gel and cream, we believe this is proba-8 S7 _" B" ]3 z n' _( j
bly more common than the rare case report in the
$ d1 I8 A" P% J& c( K/ ~literature.4
" [; `( I+ q/ N2 g( C. |0 ^Patient Report
* N9 b6 u& I9 fA 16-month-old white child was referred to the
. R6 u4 f/ P. L) F7 Vendocrine clinic by his pediatrician with the concern
: p1 j# I, J# n0 ~of early sexual development. His mother noticed
: W+ v$ ~$ u. _; i# blight colored pubic hair development when he was
! R. @! e9 f9 e7 b' u( fFrom the 1Division of Pediatric Endocrinology, 2University of
$ f$ |" S( g: L6 V" LSouth Alabama Medical Center, Mobile, Alabama.
0 j. v/ s3 J; z: x1 M" ?Address correspondence to: Samar K. Bhowmick, MD, FACE,8 F( Y5 } ~; k( w
Professor of Pediatrics, University of South Alabama, College of" c, H- w* p% i P
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
5 p2 N: Z6 E! s# J) t; {e-mail: [email protected].
4 _ n* A) _: W$ H" b: G3 O. z" Uabout 6 to 7 months old, which progressively became7 _$ M+ X g, A- n6 P$ _
darker. She was also concerned about the enlarge-
4 [, j: S+ j3 h, x: dment of his penis and frequent erections. The child$ l& V2 m6 U& q2 k0 t! |8 R
was the product of a full-term normal delivery, with
6 i3 c: ^& ?4 Ta birth weight of 7 lb 14 oz, and birth length of3 C7 A/ h' Q0 k4 {5 \
20 inches. He was breast-fed throughout the first year
- A8 i# I1 y! a' rof life and was still receiving breast milk along with! Z8 a+ k) p& M! `- W, ~6 V
solid food. He had no hospitalizations or surgery,
: d8 `: ` y9 R8 H, Gand his psychosocial and psychomotor development
& M" }2 w. p9 qwas age appropriate.
6 r8 S: Y7 l. ^$ b3 E: bThe family history was remarkable for the father,
0 _$ w& I* P" ^/ H! o+ j4 B( _) Swho was diagnosed with hypothyroidism at age 16,* i: n$ X' L9 D, W
which was treated with thyroxine. The father’s6 y0 Z& x+ Y8 t, }# h( [7 s
height was 6 feet, and he went through a somewhat
1 h. G6 V+ l1 Z0 H6 Aearly puberty and had stopped growing by age 14.( ?& C2 P2 c. J% Z ?' X
The father denied taking any other medication. The
! d$ p0 O, e9 ~8 c9 M' hchild’s mother was in good health. Her menarche; g7 c, B0 Y2 v8 Q& ]- o% P
was at 11 years of age, and her height was at 5 feet+ s1 ^2 o P% a3 L# f
5 inches. There was no other family history of pre-
( m3 b! R( _8 j7 A/ k4 t0 Acocious sexual development in the first-degree rela-& e* c# m1 p+ X6 ?% X
tives. There were no siblings./ \5 r0 N+ N2 w- J- L2 f
Physical Examination
# p f6 p9 R" O6 O3 _3 hThe physical examination revealed a very active,( `; s* Y1 T4 b! |
playful, and healthy boy. The vital signs documented0 n( O: X" Y. @' h G
a blood pressure of 85/50 mm Hg, his length was
9 @1 R$ M, R! [90 cm (>97th percentile), and his weight was 14.4 kg
. x: @2 R4 C: s# K) ]( r9 L(also >97th percentile). The observed yearly growth
1 L M8 d' ^+ {6 A2 \/ `velocity was 30 cm (12 inches). The examination of3 @, ~+ o8 T4 @2 \ o9 C
the neck revealed no thyroid enlargement.
. m& g# w" o! R- R6 A1 WThe genitourinary examination was remarkable for' o" C1 w/ C# ]- w4 B
enlargement of the penis, with a stretched length of
$ v7 n+ p& y' O! y2 m! u2 m$ h8 cm and a width of 2 cm. The glans penis was very well
1 L: K; V/ R) F, `developed. The pubic hair was Tanner II, mostly around+ }9 |5 A) U& l( R$ Q) U( E/ n
540/ ~& N( P4 q7 u! U; g; P \, z
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ ]9 U& b# E+ N' ]* k/ m8 Gthe base of the phallus and was dark and curled. The ~' W: W# C: K1 s( Q: i1 J
testicular volume was prepubertal at 2 mL each.
7 Q1 n% o$ X* w. t7 EThe skin was moist and smooth and somewhat. {2 O+ l* n3 e, i. Y; ^
oily. No axillary hair was noted. There were no" h: S% r% I# s$ j* w8 g
abnormal skin pigmentations or café-au-lait spots.3 L, l9 e$ }' `! B# k
Neurologic evaluation showed deep tendon reflex 2+- D: @7 T; C. r* ~
bilateral and symmetrical. There was no suggestion
H( n2 s4 K! T8 rof papilledema.2 B7 K. U- J2 U) L4 P; u; l6 _; m
Laboratory Evaluation2 e$ @' `- H8 g0 h; [) n' g3 G
The bone age was consistent with 28 months by% B# Z' Y1 X- S. n o9 C; O2 [
using the standard of Greulich and Pyle at a chrono-" L# T6 f! |' y+ T& w8 [' `% k- x4 u
logic age of 16 months (advanced).5 Chromosomal
, f( w" |' {+ akaryotype was 46XY. The thyroid function test
3 A/ ?& R+ ^6 Z. `1 ]( _ k* Hshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
1 T0 F) R0 M* l" d, ? ?lating hormone level was 1.3 µIU/mL (both normal).
; L0 l/ L5 w7 hThe concentrations of serum electrolytes, blood
! g; G, F- C0 furea nitrogen, creatinine, and calcium all were1 x5 Y+ q, `$ ]
within normal range for his age. The concentration
& y/ c7 A$ h; D' r; `of serum 17-hydroxyprogesterone was 16 ng/dL
6 V9 @" |8 I9 p! z(normal, 3 to 90 ng/dL), androstenedione was 20% ^" S, E5 N6 @1 Y0 u# ?# ^4 v
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-( U3 d! g k* \6 |, k
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
; m: r% @3 m: f3 }" M2 ]desoxycorticosterone was 4.3 ng/dL (normal, 7 to u0 M( P6 W$ a$ _3 w/ Q
49ng/dL), 11-desoxycortisol (specific compound S)5 o$ A& b! Q1 J
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
. ?2 S/ H! o2 {# ?tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
h# y% n3 }6 o: H. htestosterone was 60 ng/dL (normal <3 to 10 ng/dL),$ \2 p+ E* X/ J6 g, [
and β-human chorionic gonadotropin was less than
, _) H& l1 G r5 mIU/mL (normal <5 mIU/mL). Serum follicular
% V3 d+ r# w2 p( H/ wstimulating hormone and leuteinizing hormone
9 Y7 R- {0 L9 N+ a5 Tconcentrations were less than 0.05 mIU/mL. e1 O1 R6 ~" L1 V; p8 [
(prepubertal).
" s4 r( `- n9 I XThe parents were notified about the laboratory9 m1 n k8 Z }# e+ q( t
results and were informed that all of the tests were
0 T3 o, t! i2 X6 \, G* Znormal except the testosterone level was high. The% p) U$ ]- E: V, r2 c0 e1 J
follow-up visit was arranged within a few weeks to
* m5 a2 W4 @' g, A4 N2 p* Pobtain testicular and abdominal sonograms; how-
: Y' U# \# k" t' l( [ever, the family did not return for 4 months., u* d2 z3 O# ~! d% G$ c) }* F
Physical examination at this time revealed that the
( o- W p' f2 E( s7 Achild had grown 2.5 cm in 4 months and had gained
. m5 Y3 Q# f" v* K u: C2 kg of weight. Physical examination remained
[- D# J; m+ r- v4 B' Bunchanged. Surprisingly, the pubic hair almost com-
/ u( ^9 ?& @: Ppletely disappeared except for a few vellous hairs at0 p( [; d* o# }% ^/ a1 J6 t
the base of the phallus. Testicular volume was still 22 o T( h% T. T4 M. Q# o! M1 s
mL, and the size of the penis remained unchanged.( }5 ]8 u4 Q/ N# A' p
The mother also said that the boy was no longer hav-
\/ E; E+ S6 I0 d' M d: a1 ving frequent erections.
8 a8 X2 k; r W: S7 e8 v1 O) dBoth parents were again questioned about use of
! f, @/ }# G+ j6 P9 tany ointment/creams that they may have applied to4 Y, h" n0 ?) f) s. o2 Z& k: G
the child’s skin. This time the father admitted the
# ? R" J) K. a8 hTopical Testosterone Exposure / Bhowmick et al 541( L6 {9 _2 r7 i% A ]$ a3 C* J A
use of testosterone gel twice daily that he was apply-: ]' p% {9 a1 D# M" h0 V$ [
ing over his own shoulders, chest, and back area for4 ~+ s# |* r. r1 i1 J# L' l
a year. The father also revealed he was embarrassed
& `; R$ d7 \8 y' l$ f# qto disclose that he was using a testosterone gel pre-. o! N/ v& d! w6 ^% t: r, Q, R6 }
scribed by his family physician for decreased libido Y" f, o" ?, o: d" x4 ]
secondary to depression.1 k' ^8 L7 }6 J5 H: ]" X
The child slept in the same bed with parents.4 C( }; _3 X Q) G: D
The father would hug the baby and hold him on his8 B, l% C8 d) N) J7 N
chest for a considerable period of time, causing sig-) l# `* f* B% g' V
nificant bare skin contact between baby and father.. f; e4 w* }. H% q3 y% N
The father also admitted that after the phone call,
6 r- ~ O T. m6 r' w V2 pwhen he learned the testosterone level in the baby
/ V! F" G! ^ t6 n# k3 [2 Q; P; A) Lwas high, he then read the product information5 v$ X6 T+ Y6 {8 y
packet and concluded that it was most likely the rea-
9 U) @) J7 H& ]; y6 r9 Y+ X( yson for the child’s virilization. At that time, they
2 R. E, ~; H! P5 }8 m" d! |decided to put the baby in a separate bed, and the& t5 s# _- Z$ t) |0 X
father was not hugging him with bare skin and had
3 ^: X& P0 @3 \) R T0 Lbeen using protective clothing. A repeat testosterone8 D$ M/ c# U3 [- [% U* P1 t
test was ordered, but the family did not go to the8 B7 I b) F3 b/ K; z( g/ o; P
laboratory to obtain the test.
$ _/ R5 s( s9 _- q5 Y% B& J- \9 xDiscussion
9 v7 A; [6 s/ O8 J% BPrecocious puberty in boys is defined as secondary
" i8 q/ _" o1 L4 Fsexual development before 9 years of age.1,4
9 u* D" F: c$ f( f5 B2 }/ `Precocious puberty is termed as central (true) when) {* r5 O- _7 D( _! Q% ~9 H, @
it is caused by the premature activation of hypo-
% P6 z+ R+ n vthalamic pituitary gonadal axis. CPP is more com-9 M' i! a! `( \$ `/ d
mon in girls than in boys.1,3 Most boys with CPP( d) R. }" t& C& A7 ]" N
may have a central nervous system lesion that is
z0 T8 \! l! r1 M( B9 dresponsible for the early activation of the hypothal-
- M$ m3 W$ u, }% e2 c/ B; F. Lamic pituitary gonadal axis.1-3 Thus, greater empha-
) F; b4 x( B. P, q. _/ ?) c5 z" P! b1 [sis has been given to neuroradiologic imaging in
+ ~7 q* E8 |8 O, i' {- _, ?+ {boys with precocious puberty. In addition to viril-
! R3 t2 N/ @; y, [5 y8 g+ sization, the clinical hallmark of CPP is the symmet-
% Z% ~& l& z/ S2 r5 h" Erical testicular growth secondary to stimulation by& Y' x4 W8 V4 L4 d, U4 I
gonadotropins.1,3
. m7 y# h7 E; ^, P0 `" J/ }8 _Gonadotropin-independent peripheral preco-8 E4 C" q/ \) w3 k2 r
cious puberty in boys also results from inappropriate
+ p- {3 U6 M% E. aandrogenic stimulation from either endogenous or
9 ~, \6 H; h" \; `exogenous sources, nonpituitary gonadotropin stim-
% {4 j% G9 `( }ulation, and rare activating mutations.3 Virilizing/ g) O! b; q* @6 Y0 x; Q5 I
congenital adrenal hyperplasia producing excessive) ~1 a" {9 X7 W; E
adrenal androgens is a common cause of precocious
7 R8 p7 a( ^! p* J+ Tpuberty in boys.3,4; ?% C% c5 }+ `4 {% |
The most common form of congenital adrenal
& U! P" }- D$ j% {* j/ d) D0 @hyperplasia is the 21-hydroxylase enzyme deficiency." F. j0 r& }3 O9 n
The 11-β hydroxylase deficiency may also result in
* h( P3 y Y& z, r) `excessive adrenal androgen production, and rarely,
G4 J4 a4 m9 T+ _$ _: @* Ban adrenal tumor may also cause adrenal androgen" ^6 ]7 Z O% E+ }7 e
excess.1,34 X% A$ l: j1 u! B. r: t
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
2 v6 X S, ^7 G8 p, I3 v542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
6 l6 x b$ S: {' V! x3 AA unique entity of male-limited gonadotropin-+ F0 }# U2 v) n0 I. {$ o, U
independent precocious puberty, which is also known
2 ~+ F) x/ l. O/ ?4 M# K% J eas testotoxicosis, may cause precocious puberty at a
# J3 ?7 M% e0 R( {0 {) ~0 pvery young age. The physical findings in these boys/ k% x7 l( D3 q" J5 |6 [8 V2 t: O
with this disorder are full pubertal development,! c# @% M/ J7 o% _: |: B! ?9 B. _
including bilateral testicular growth, similar to boys
" f' ~8 E2 Z0 W, ywith CPP. The gonadotropin levels in this disorder
7 _& |' k0 q9 H) P7 Zare suppressed to prepubertal levels and do not show$ F% N% o+ w" Z$ Y' U: h* ?2 Y
pubertal response of gonadotropin after gonadotropin-
/ R3 F# r) y5 e; @% F$ N F4 q. Ureleasing hormone stimulation. This is a sex-linked7 o$ _& i8 p4 M# V8 }
autosomal dominant disorder that affects only d4 e) W. R+ A; P- ?
males; therefore, other male members of the family. n& T$ V5 Q; v
may have similar precocious puberty.3
) n( w6 Z y+ ^5 Y; n. }In our patient, physical examination was incon-7 k" ?/ V2 L1 j% ~4 u5 P. U4 T
sistent with true precocious puberty since his testi-4 U% B u$ H) L+ l5 I" N8 ~
cles were prepubertal in size. However, testotoxicosis) }8 ?$ t1 I& J% I- b
was in the differential diagnosis because his father
, P. N" Z7 x: E. \% W! z7 Jstarted puberty somewhat early, and occasionally,
6 ?5 V4 B; E$ x9 z% {testicular enlargement is not that evident in the
% ^2 P @0 e0 h6 A0 Hbeginning of this process.1 In the absence of a neg-. S. r1 I0 d+ q% t! Z
ative initial history of androgen exposure, our
v7 \8 p G& G- m4 Qbiggest concern was virilizing adrenal hyperplasia,
* I& j' u3 r5 ]; @2 C% ? geither 21-hydroxylase deficiency or 11-β hydroxylase. \# k/ y7 G5 ]- c) s
deficiency. Those diagnoses were excluded by find-
$ t0 O- a- ~: \# King the normal level of adrenal steroids.
3 I3 {7 U7 G! b! N# v, X8 N9 UThe diagnosis of exogenous androgens was strongly
" r, T* E% k" Gsuspected in a follow-up visit after 4 months because+ Q* [8 |6 W% n; ]! k$ J
the physical examination revealed the complete disap-
/ X) R4 s$ G9 s( |, N- dpearance of pubic hair, normal growth velocity, and* d: g. f3 s' q# L% u/ z( o5 A
decreased erections. The father admitted using a testos-
9 L$ j* y0 [* Y4 Mterone gel, which he concealed at first visit. He was. @) W0 \4 g& i! c/ ^) y
using it rather frequently, twice a day. The Physicians’
W: ]) y9 H5 PDesk Reference, or package insert of this product, gel or
, V+ |7 B( ?4 j$ _cream, cautions about dermal testosterone transfer to
' t) k+ E8 X: [+ O# gunprotected females through direct skin exposure.4 H& ~+ T" D" |- w9 W5 i
Serum testosterone level was found to be 2 times the( `2 T3 `( T$ Q% L* r( {1 g
baseline value in those females who were exposed to5 s: d3 \) ?4 Z- a
even 15 minutes of direct skin contact with their male/ @- @1 g9 x& A8 Y8 r
partners.6 However, when a shirt covered the applica-1 ], |1 D, N; c2 B+ X# |2 k7 q7 R9 _, S
tion site, this testosterone transfer was prevented." N4 H- _3 ]6 G* {. N& i6 t
Our patient’s testosterone level was 60 ng/mL,
# `! r. a, y$ b( @which was clearly high. Some studies suggest that$ Y) ~: ~6 }* i1 y
dermal conversion of testosterone to dihydrotestos-$ @0 K5 ~3 }5 x" w! l3 \
terone, which is a more potent metabolite, is more
9 N4 m P- M `% B }active in young children exposed to testosterone
4 o/ l* _/ ~# q& X9 ]" v6 qexogenously7; however, we did not measure a dihy-0 E$ t3 i' Y7 g9 V; v! D3 I8 Q
drotestosterone level in our patient. In addition to
/ F. B! E* f! a9 T' L& Dvirilization, exposure to exogenous testosterone in D$ F0 b j7 _6 u6 z& e3 k
children results in an increase in growth velocity and
/ g0 w' h" d- T( O: K" Aadvanced bone age, as seen in our patient.
; Q0 ?2 G- ]5 A) T+ B kThe long-term effect of androgen exposure during
. K' O$ e( U& X8 y# ]4 pearly childhood on pubertal development and final
7 @, h, I$ }$ t( a/ y* Uadult height are not fully known and always remain6 a2 k3 A, C! F
a concern. Children treated with short-term testos-& M$ o. E9 M: A2 q9 R
terone injection or topical androgen may exhibit some
! h/ [; D1 K" M' m. z$ a( `acceleration of the skeletal maturation; however, after/ \0 |$ B8 R. N1 K
cessation of treatment, the rate of bone maturation7 @3 q0 p4 h+ R2 ]3 O2 r
decelerates and gradually returns to normal.8,92 T! ^' X. K- P% u+ `
There are conflicting reports and controversy: h. J+ U2 A2 k9 T
over the effect of early androgen exposure on adult
* o& ] o+ b2 Y5 v \8 @( Xpenile length.10,11 Some reports suggest subnormal& q) ?6 l" ]( ~( D5 h4 N( V
adult penile length, apparently because of downreg-$ U r( {; ^, ^2 o1 E1 ~1 |
ulation of androgen receptor number.10,12 However,
9 D7 i5 j' `0 V: P2 ~. O* Z1 e; ISutherland et al13 did not find a correlation between
q5 i% C. i, ?# n5 W# Tchildhood testosterone exposure and reduced adult
# |; K `0 ?% r8 r% rpenile length in clinical studies. {+ j+ _) ]! G2 [1 S
Nonetheless, we do not believe our patient is
+ i! J S- R6 p; Dgoing to experience any of the untoward effects from
: e( ]: o2 o6 Rtestosterone exposure as mentioned earlier because, K4 w( Z5 k2 i4 ]" ^ k8 I
the exposure was not for a prolonged period of time.4 ]& p' O9 y! g. V& F) J
Although the bone age was advanced at the time of/ d" @2 }6 V4 I! h# @6 V+ C
diagnosis, the child had a normal growth velocity at
' z4 E+ M& I8 j4 q. ]the follow-up visit. It is hoped that his final adult3 t. E3 q# ~- ]/ S
height will not be affected.
+ }7 @2 a% n$ s" `% s: KAlthough rarely reported, the widespread avail-
" G% s% x% K, B _2 H, F: x8 `ability of androgen products in our society may
: M. y* a; @: j* Y" _* Zindeed cause more virilization in male or female9 ~. ?0 I3 Y2 @) i8 N
children than one would realize. Exposure to andro-) M4 \) K. F& `! C7 p
gen products must be considered and specific ques-
4 d4 S1 X; q6 f+ J) A0 {% j. ltioning about the use of a testosterone product or
* u+ r5 ^! w1 t; zgel should be asked of the family members during
2 S! {9 v; `1 r6 t- E0 nthe evaluation of any children who present with vir-% j, g5 t/ W( X$ ~4 Q6 i
ilization or peripheral precocious puberty. The diag-
1 d* h3 N( M) m: k' J2 knosis can be established by just a few tests and by
& q+ z2 n( a: Y/ w; C. Gappropriate history. The inability to obtain such a5 A0 a. a2 O7 z; I% f' d0 U o
history, or failure to ask the specific questions, may' @3 M" _) N: Z& t
result in extensive, unnecessary, and expensive) V7 H: q7 ]* I+ | s0 p) t
investigation. The primary care physician should be
$ ^7 ]5 L4 Z+ h; X/ C% x+ j$ Naware of this fact, because most of these children
$ Q; K8 A; d. K: tmay initially present in their practice. The Physicians’
4 T- y# j! q! }* w; DDesk Reference and package insert should also put a
0 T6 U, @. a; v9 P8 \( L/ Pwarning about the virilizing effect on a male or
5 X, V4 V% _7 @female child who might come in contact with some-
5 T! u% e2 |- F0 qone using any of these products.$ |( ~2 @+ p" p* h
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Economics Company, Inc; 2004:3239-3241.3 b2 h# V' @& N6 Q( v5 V
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